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Which of the following downregulates pyruvate dehydrogenase by covalently modifying the enzyme complex? ATP Acetyl CoA AMP ADP Calcium ions

Question

Which of the following downregulates pyruvate dehydrogenase by covalently modifying the enzyme complex? ATP Acetyl CoA AMP ADP Calcium ions

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Solution

Para responder a esta pregunta, es importante entender cómo se regula el complejo de la piruvato deshidrogenasa (PDH). La PDH es una enzima clave en el metabolismo que convierte el piruvato en acetil-CoA, un paso crucial en la respiración celular.

  1. ATP: El ATP es una molécula de alta energía que indica que la célula tiene suficiente energía. El ATP puede activar la piruvato deshidrogenasa quinasa (PDK), que fosforila y, por lo tanto, inactiva la PDH.

  2. Acetyl CoA: El acetil-CoA es un producto de la reacción catalizada por la PDH. Altos niveles de acetil-CoA indican que hay suficiente sustrato para el ciclo de Krebs, lo que también puede activar la PDK, resultando en la fosforilación e inactivación de la PDH.

  3. AMP: El AMP es un indicador de baja energía en la célula. No está directamente involucrado en la fosforilación de la PDH.

  4. ADP: Similar al AMP, el ADP indica niveles bajos de energía. No está directamente involucrado en la fosforilación de la PDH.

  5. Calcium ions: Los iones de calcio pueden activar la piruvato deshidrogenasa fosfatasa (PDP), que desfosforila y activa la PDH. No están involucrados en la inactivación de la PDH.

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